> as lemmas
sphaerocone
sphaerocone n. 
/ˈsfɛrəˌkoʊn/ Palaeontology an ammonoid with a very involute shell in which the outer whorl conceals the inner one and the whole has a globular form.
Brit. /ˈsfɪərə(ʊ)kəʊn/
, /ˈsfɪərə(ʊ)kəʊn/U.S. /ˈsfɪrəˌkoʊn/
, /ˈsfɪrəˌkoʊn//ˈsfɛrəˌkoʊn/ΘΚΠ
the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Cephalopoda > [noun] > order Tetrabranchiata > family Ammonitidae > member of > sphaerocone
sphaerocone1923
1923 H. H. Swinnerton Outl. Palæontol. x. 214 The forms assumed by these derivatives [of cadicones] were determined mainly by modification of the whorl shape in two directions. In the one the venter and dorsum became arched; the outer consequently embraced the inner whorls and the umbilicus became narrower and even disappeared. The shell thus produced was globose in shape and is described as a sphærocone... In the other modification the whorl increased in height..; the effect of this was to produce a shell with a widely open umbilicus and having the appearance of a coiled snake. The descriptive term serpenticone is therefore applied to this type of shell.
1970 R. M. Black Elements Palaeontol. viii. 89 Sphaerocones occur repeatedly during ammonoid history.
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as lemmas
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